Seat backrest

Abstract

A seat is disclosed. The seat includes a frame, a seat pan connected to the frame and a backrest. The backrest includes a main panel, an upper panel hingedly connected to the main panel and a lower panel hingedly connected to the main panel. The upper panel is connected to the frame and the lower panel is connected to the seat pan.

What is claimed: 
     
       1. A seat, comprising:
 a base frame; 
 a seat pan connected to the base frame; and 
 a backrest having a main panel, an upper panel hingedly connected to the main panel and a lower panel hingedly connected to the main panel, the upper panel further connected to the base frame and the lower panel further connected to the seat pan; 
 a first hinge connecting the main panel to the upper panel; 
 a second hinge connecting the main panel to the lower panel; 
 a third hinge connecting the upper panel to the base frame;
 wherein the lower panel is connected to the seat pan, the seat pan is secured to a seat frame pivotally mounted to the base frame and the lower panel comprises an aperture configured to receive a fastener to secure the lower panel with respect to the seat pan. 
 
 
     
     
       2. The seat of  claim 1 , wherein the seat frame includes a hook member configured to engage a stop member on the base frame. 
     
     
       3. The seat of  claim 1 , wherein the main panel comprises a laminate structure. 
     
     
       4. The seat of  claim 1 , wherein the main panel comprises a plurality of interior apertures. 
     
     
       5. The seat of  claim 1 , wherein the base frame includes a cross member and wherein the third hinge is configured for connection to the cross member using a first plurality of removable fasteners. 
     
     
       6. The seat of  claim 5 , wherein the lower panel is configured for connection to the seat pan using a second plurality of removable fasteners. 
     
     
       7. The seat of  claim 6 , wherein the lower panel comprises a plurality of slotted apertures configured to receive the second plurality of removable fasteners and wherein the slotted apertures are configured for positional adjustment of the lower panel with respect to the seat frame. 
     
     
       8. A backrest for a jumpseat, comprising:
 a main panel; 
 an upper panel hingedly connected to the main panel by a first hinge; and 
 a lower panel hingedly connected to the main panel by a second hinge,
 wherein the upper panel is configured for hinged connection to a base frame of the jumpseat and the lower panel is configured for connection to a seat frame of the jumpseat and 
 wherein the lower panel includes a plurality of slotted apertures configured to receive a plurality of removable fasteners and the plurality of slotted apertures is configured for positional adjustment of the lower panel with respect to the seat frame. 
 
 
     
     
       9. The backrest of  claim 8 , wherein the main panel includes a layer of sheet metal. 
     
     
       10. The backrest of  claim 8 , wherein the upper panel includes a third hinge configured for connection to the base frame of the jumpseat. 
     
     
       11. The backrest of  claim 8 , wherein the main panel comprises a plurality of interior apertures. 
     
     
       12. A jumpseat, comprising
 a housing having a front surface; 
 a seat pan configured for pivotal retraction within the housing, such that a lower surface of the seat pan is flush with the front surface of the housing while the seat pan is in a retracted position; and 
 a backrest having a main panel, an upper panel hingedly connected to the main panel and a lower panel hingedly connected to the main panel, the upper panel further hingedly connected to the housing and the lower panel further hingedly connected to the seat pan,
 wherein the lower panel includes a plurality of slotted apertures configured to receive a plurality of removable fasteners and the plurality of slotted apertures is configured for positional adjustment of the lower panel with respect to the seat frame. 
 
 
     
     
       13. The jumpseat of  claim 12 , wherein the upper panel is configured for removable connection to the housing and wherein the lower panel is configured for removable connection to the seat pan.